62579266cf
Add a new driver to support the AB8500 Power Management chip, replacing the current AB4500. The new driver replaces the old one, instead of an incremental modification, because this is a substantial overhaul including: - Split of the driver into -core and -spi portions, to allow another interface layer to be added - Addition of interrupt support - Switch to MFD core API for handling subdevices - Simplification of the APIs to remove a redundant block parameter - Rename of the APIs and macros from ab4500_* to ab8500_* - Rename of the files from ab4500* to ab8500* - Change of the driver name from ab4500 to ab8500 Acked-by: Linus Walleij <linus.walleij@stericsson.com> Acked-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson SA 2010
|
|
*
|
|
* License Terms: GNU General Public License v2
|
|
* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/mfd/ab8500.h>
|
|
|
|
/*
|
|
* This funtion writes to any AB8500 registers using
|
|
* SPI protocol & before it writes it packs the data
|
|
* in the below 24 bit frame format
|
|
*
|
|
* *|------------------------------------|
|
|
* *| 23|22...18|17.......10|9|8|7......0|
|
|
* *| r/w bank adr data |
|
|
* * ------------------------------------
|
|
*
|
|
* This function shouldn't be called from interrupt
|
|
* context
|
|
*/
|
|
static int ab8500_spi_write(struct ab8500 *ab8500, u16 addr, u8 data)
|
|
{
|
|
struct spi_device *spi = container_of(ab8500->dev, struct spi_device,
|
|
dev);
|
|
unsigned long spi_data = addr << 10 | data;
|
|
struct spi_transfer xfer;
|
|
struct spi_message msg;
|
|
|
|
ab8500->tx_buf[0] = spi_data;
|
|
ab8500->rx_buf[0] = 0;
|
|
|
|
xfer.tx_buf = ab8500->tx_buf;
|
|
xfer.rx_buf = NULL;
|
|
xfer.len = sizeof(unsigned long);
|
|
|
|
spi_message_init(&msg);
|
|
spi_message_add_tail(&xfer, &msg);
|
|
|
|
return spi_sync(spi, &msg);
|
|
}
|
|
|
|
static int ab8500_spi_read(struct ab8500 *ab8500, u16 addr)
|
|
{
|
|
struct spi_device *spi = container_of(ab8500->dev, struct spi_device,
|
|
dev);
|
|
unsigned long spi_data = 1 << 23 | addr << 10;
|
|
struct spi_transfer xfer;
|
|
struct spi_message msg;
|
|
int ret;
|
|
|
|
ab8500->tx_buf[0] = spi_data;
|
|
ab8500->rx_buf[0] = 0;
|
|
|
|
xfer.tx_buf = ab8500->tx_buf;
|
|
xfer.rx_buf = ab8500->rx_buf;
|
|
xfer.len = sizeof(unsigned long);
|
|
|
|
spi_message_init(&msg);
|
|
spi_message_add_tail(&xfer, &msg);
|
|
|
|
ret = spi_sync(spi, &msg);
|
|
if (!ret)
|
|
ret = ab8500->rx_buf[0];
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devinit ab8500_spi_probe(struct spi_device *spi)
|
|
{
|
|
struct ab8500 *ab8500;
|
|
int ret;
|
|
|
|
ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
|
|
if (!ab8500)
|
|
return -ENOMEM;
|
|
|
|
ab8500->dev = &spi->dev;
|
|
ab8500->irq = spi->irq;
|
|
|
|
ab8500->read = ab8500_spi_read;
|
|
ab8500->write = ab8500_spi_write;
|
|
|
|
spi_set_drvdata(spi, ab8500);
|
|
|
|
ret = ab8500_init(ab8500);
|
|
if (ret)
|
|
kfree(ab8500);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ab8500_spi_remove(struct spi_device *spi)
|
|
{
|
|
struct ab8500 *ab8500 = spi_get_drvdata(spi);
|
|
|
|
ab8500_exit(ab8500);
|
|
kfree(ab8500);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct spi_driver ab8500_spi_driver = {
|
|
.driver = {
|
|
.name = "ab8500",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ab8500_spi_probe,
|
|
.remove = __devexit_p(ab8500_spi_remove)
|
|
};
|
|
|
|
static int __init ab8500_spi_init(void)
|
|
{
|
|
return spi_register_driver(&ab8500_spi_driver);
|
|
}
|
|
subsys_initcall(ab8500_spi_init);
|
|
|
|
static void __exit ab8500_spi_exit(void)
|
|
{
|
|
spi_unregister_driver(&ab8500_spi_driver);
|
|
}
|
|
module_exit(ab8500_spi_exit);
|
|
|
|
MODULE_AUTHOR("Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com");
|
|
MODULE_DESCRIPTION("AB8500 SPI");
|
|
MODULE_LICENSE("GPL v2");
|